Advanced inorganic chemistry / by G.H. Bailey ; edited by William Briggs.

  • Bailey, G. H.
Date:
[1898]
Catalogue details

Licence: Public Domain Mark

Credit: Advanced inorganic chemistry / by G.H. Bailey ; edited by William Briggs. Source: Wellcome Collection.

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    (21) 25 c.c. of marsh gas (GH4) are mixed with 500 c.c. of air and exploded in a eudiometer; what volume of gas should there be (a) before the removal of the carbon dioxide formed, {b) after the absorption of the carbon dioxide by means of caustic potash ? The temperature and pressure may be assumed to be the same when each of the readings of volume were taken. The chemical reaction which takes place is CH^ + 2 O2 = CO2 + 2 H2O, 2 vols. 4 vols. 2 vols, the nitrogen of the air taking no part in the combustion. It is further manifest on inspection that the 2 volumes of marsh gas and 4 volumes of oxygen, before explosion, give rise to 2 volumes of carbon dioxide, the space occupied by the water being negligible. Thus 6 volumes are reduced to 2, and the diminution is 4 volumes. But the marsh gas occupies 25 c.c, and is represented by 2 volumes. The diminution in volume is therefore 50 c.c, and the 525 cc. of mixed gases originally present in the eudiometer have been reduced to 475 c.c. Similarly the CO2 occupies the same volume as the marsh gas from which it was obtained, and is thus 25 cc, and if this be removed there will remain 450 cc. of gas in the eudiometer. The result is that the residual gas— (a) before removal of CO2 is 475 c.c. (6) after „ „ „ 450 c.c. (22) 10 c.c. of Hquid carbon bisulphide (sp. gr. 2-63) are burnt in oxygen ; find the volume of the resulting gases measured at standard temperature and pressure. We must first ascertain the weight of the carbon bisulphide. Its sp. gr. being 2 63, the 10 c.c will weigh 263 grammes. The chemical change during combustion is represented in the equation CS2 + 3 O2 = CO2 + 2 SO2. 76 grammes of CS2 yield 44 grammes or 22-24 litres COg. „ „ 128 „ „ 44-48 „ SO2. „ „ ,, „ 66-72 litres of CO2 and SO2 together.